Background Image with Custom Code for Mobile

Hi there, 

I've had to manipulate css to change/overlay the background image of the landing page for the mobile version. But now all my other pages like the contact and the terms & condition pages have the same background image as well. I only specifically want it on the landing page for the mobile.. 

this is the code i've used: 

 @media only screen and (max-width: 640px){
#page .page-section:nth-child(1) .section-background img {opacity:0 }
#page .page-section:nth-child(1)  .section-background {
background-image: url(https://static1.squarespace.com/static/63dc0265b9acba3f7f59581b/t/63e29a7b4365543e02b93375/1675795070170/MobileBackground.png);
background-size: 100%;
background-position: center;
background-repeat: no-repeat;
   }
}

I also want to swap out an image of an image block so that the image on the desktop is a different one than the one on the mobile. Any ideas of how to accomplish that? 

Thank you, 

Jenny!

Hi,

What is your site url?